title: WITHDRAWN: Abatacept as a first-line biological therapy.
abstract: The Publisher regrets that this article is an accidental duplication of an article that has already been published, http://dx.doi.org/10.1016/j.autrev.2013.06.008. The duplicate article has therefore been withdrawn.
authors.affiliation: Division of Rheumatology, University of Pavia, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy. Electronic address: caporali@smatteo.pv.it.
authors.forename: Roberto
authors.initials: R
authors.lastname: Caporali
authors.forename: Serena
authors.initials: S
authors.lastname: Bugatti
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Cavagna
authors.forename: Marco
authors.initials: M
authors.lastname: Antivalle
authors.forename: Fabiola
authors.initials: F
authors.lastname: Atzeni
authors.forename: Piercarlo Sarzi
authors.initials: PS
authors.lastname: Puttini